ps how common is the .308 round? I know nothing about weapons outside of those organic to the army platoon

.308 is quite common, but none of the rifles you listed commonly use it. Most will be rather funky millitary rounds from Europe. Most Enfileds will be .303 Brittish, Mausers run from 6.5x55 mm (swedish) to 8x57 (lots of countries). I believe the Nagants are 7.62x54R. That is, if my memory isn't all frazzled. A good gunshop should have what you need. The 8mm Mauser rounds are even available at my local big box stores.

I actually have what I believe is a czech vz24 (Mauser 98) I would sell if you were local. I have too many rifles that never get used.